Apparatus for microscopic projection



' March 18,1941.

L.. N. MESTRE APPARATUS FOR IIICROSCOPIC PROJECTION I flied-Aug. 10, 1937 Fatenied More Edi acetate r 2:; nos roe moscorro PROJEQTEQN Louis Nicolas Mes rincicns Etahlissements i.

r France, ignor bier, nerd & Tn-

renne, Paris, Free, a French comp application august 10,1931, Serial No.'158,417

1 November 38), 1936 of the carbons-of which necessitates frequent stoppage and'wherein furthermore, the use of one condenser per objective an'dfthe' placing in position of the preparation render the projection My invention has for its object illuminatingsystem, more particularly for microscopic projection, which comprises a high pressuremercury vapour lamp forming an absolutely stable linear source of light of great brilliancyycooperating with an optical system producing from said source an image of very small size.

v According to an embodiment, said optical systern includes in front of a condenser of the usual 'type, a reflecting surface, oi revolution about the optical axis and of relatively great length, called recuperator and arranged so as to bring the marginal rays back towards the optical axis, the said rays which are thus reflected being sent surface or recuperator, which is likewise a surrace of revolution about the 'optical axis and arranged between said condenser and said image.

Other characteristics and advantages of my invention will moreover become apparent from the ensuing description taken with reference to the accompanying drawing which is given solely by way of example and which shows diagrammatically an embodiment of my invention.

40 According to the embodiment shown, the linear luminous source 9 formed by a high pressure gas lamp is placed at the focus of a convergent optical system l3 forming a condenser and which is arranged laterally relatively to the optical axisjll oi the projection apparatus. The luminous beam emerging from the system I3 is reflected by a mirror I inclined at 45 in the direction of said axis 20 and supplies at the outlet of the water tank I a real'image 9' from which a further convergent system l5 supplies the final image 9" on the'plane of the object to be projected.

Two reflecting surfaces l2 and I2 of revolution about the axis 20, and made of silvered metal or of polished glass and called "recuperators," are arranged one on either side of the system it. The recuperator l2 which is shown as of cylindr cal and rather unstable are lamp, the wearing away back towards the image by a second reflecting shape brings the marginal luminous beams due to the great length of the source 9, back towards the optical axis 20 and renders them useful, and

the recuperator l2 shown as of conical shape has a shape such that it reflects, towards the image 9", the rays reflected by the recuperator I! which i have passed through the condenser l5.

intense luminous image which is almost a point is thus obtained on thepreparation or the like to be projected.

While I have described what I at present consider a preferred embodiment of my invention, it willibe obvious .to those skilled in the art that various changes and modifications may be made without departing from my invention and I therefore aim in the appended claim to cover allsuch changes and modificationsas fall within the true spirit and scope of my invention;

What I claim is: illuminating system more particularly designed for an apparatus for microscopic projec tion and including a high pressure gas lampfcrm ing a linear source of light and an optical device the optical axis of which is substantially perpendicular to said source of light, said optical device including a convergent'op tical systematranged to form a real image of said linear source of light, a further convergent system placed between said image and the object planejgand arranged to form on said plane and from said image a further real image of great brilliancyI of said source and of very small size, a tubular body provided between said first named real image and said further convergent system, the internal surface of said body being a. surface of revolutionabout said axis of said optical device and of suincient diameter not to be impinged on by the rays emanating from said first named image and ar-.

riving without deviation on said further convergent system, said surface being thus arranged to reflect the marginal rays emanating from said first named image back towards said furtherconvergent system. a further tubular body disposed" LOUIS mooLAs Mnsmn. 

